The determination of the reverberation time in a model based on geometric
acoustics, which uses acoustic pressure and particle speed represented by means
of phasors as working variables, is presented. Let p[inf 1](centered
dot)(centered dot)(centered dot)p[inf m] be the pressure waves that reach the
receiver in orderly instances t[inf 1](centered dot)(centered dot)(centered
dot)t[inf m], let p[inf 0] be the phasor sum of them; and let L[inf 0] be the
corresponding equivalent level. The levels